SEE YA LATER WAYNE: Danny Welbeck has left Manchester United to join Arsenal [GETTY]

Welbeck made the short journey from the Three Lions' hotel in Watford to pass a medical at the Gunners' training ground in St Albans.

Arsenal boss Arsene Wenger turned to Welbeck after failing to in a bid to sign Wilfried Bony Swansea. The Ivory Coast hitman had a £19m clause in his contract but Swans chairman Huw Jenkins insisted he wanted much more than that for 25-year-old.

The Gunners explored the option of taking Welbeck on loan but United, having landed Radamel Falcao on a short-term deal, insisted on selling the Manchester-born 23-year-old.

Welbeck had also been on the radar of Arsenal's north London rivals Spurs, but Wenger made his move with Olivier Giroud ruled out until Christmas.

“I've joined the biggest club in the world”

Javier Hernandez

Gunners star Jack Wilshere is understood to have given Wenger a glowing report about England team-mate Welbeck's attitude and professionalism.

Wenger had investigated the possibility of bringing in Falcao from Monaco but was beaten to the deal by Louis van Gaal.

United also let striker Javier Hernandez join Real Madrid on a season-long loan.

The Spaniards will also have first option to buy 'Little Pea' for around £14m next summer.

"I've joined the biggest club in the world," the 26-year-old said. "To wear this jersey is a dream come true for any player in the world. I am delighted to be here."